# std::shared_lock<Mutex>::try_lock

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< cpp‎ | thread‎ | shared lock

bool try_lock(); |  | (since C++14)

Tries to lock the associated mutex in shared mode without blocking. Effectively calls mutex()->try_lock_shared().

std::system_error is thrown if there is no associated mutex or if the mutex is already locked.

### Parameters

(none)

### Return value

true if the ownership of the mutex has been acquired successfully, false otherwise.

### Exceptions

- Any exceptions thrown by mutex()->try_lock_shared().

- If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permitted.

- If the mutex is already locked, std::system_error with an error code of std::errc::resource_deadlock_would_occur.

### Example

| This section is incomplete Reason: no example

### See also

lock | locks the associated mutex (public member function)
try_lock | tries to lock (i.e., takes ownership of) the associated mutex without blocking (public member function of `std::unique_lock<Mutex>`)
try_lock_for | tries to lock the associated mutex, for the specified duration (public member function)
try_lock_until | tries to lock the associated mutex, until a specified time point (public member function)
unlock | unlocks the associated mutex (public member function)

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